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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878c8982399c825efee6f5552479d5c2aa4178f2314e7e5b4098a86c829c24e6' 
  AND token = 'h4Sh/GsbyJVb8xRKMgNSHrt5QZDB7eiEy6zE1IW7Mg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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