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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4cada912cfa2206c1d7b1239171e7a4cd90fe286f144a0e102bd44925e53fd' 
  AND token = 'J9/6+T5qjYkZMu29mM4DsnS69lUobPUKp3t3lBDFi5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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