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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c6fb1ead76db3a82c3afd9dff0eec0813e6679a7f6323d2c337f538658df70a' 
  AND token = '58QqHXsKk6e0ACErPqNE3xeh+1Y+W4C4FJTzFF/SPvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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