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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f68f52f9f407351fd4d3e89a87352b093ca9213099e1769b1465c0c025c85162' 
  AND token = 'aFKS0yqHzorKsuReQhXg/6Z73EMP/2i07J8H46wtZ3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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