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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2695b49e4ca4ba42a1790baea71369d745568a0fc8fc316519794e7aa1c3916' 
  AND token = 'QLTPAy2UnNCubphjh+DH19OJtvS8duiDP7+RcxwH0d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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