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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e4938ac86b17674cec3434b1a1db3aefeb7ce40477f42b32695b00c5ace9b0' 
  AND token = 'KKerBwmaw5D6g/Sb45ABQYb8VqnVNyNAQ3cGZhO20iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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