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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a695fd2458937849c1b3824e4228f4560337958744092852d96f9ae18250c07c' 
  AND token = '4HerAVHAfpyhymp24JYzgpdMWxFCUOU2cugTf5YVdrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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