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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5b730bbd11011e248219eec5a35da525b0b01f09f116e8d6544e3223dc32046' 
  AND token = '00aXYG67l4i2imflihq4PS7KMoy0989REjR5r6nbIKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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