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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8119f45e1614c64939c5d01d4d9521a998ecc4a48a80eed4a5b71ab8535bfde0' 
  AND token = 'rnlKiZH+c+OrfPcV0h9hJDZif/EquH50i9vJALsBBrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}