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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e0dc9ca34dd055dca0e264ab909948db22e23bdf234e4c51eaa15dcb5a5aeca' 
  AND token = '+zTwMxSaLvHp8Cu1pfGQv6lG5Oav+aNASFbjdmZP0PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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