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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6af9aff262120ca01f70a4000d17b9e728ac0d806e5819d947bc8a923424e69' 
  AND token = 'fbXgc7WOOI49fAjytIHtAMR30cNTIyYBO7m0Cmxw/Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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