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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c86b642379af56e3b6da0b60d35961f7f9b9e9028d8623aeb1ceec0c1ebcfc' 
  AND token = 'WF9d4/3LuyPKp1oIJ2cYPYSQhWxGFoxLrtjcBD+i1Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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