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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '420c7ff267b8f0b256855f57afc8adb04c4608024906079e688e30304e81d7f7' 
  AND token = 'uuLOBwqXUtfYR5lEqQieW3mtuqwfjx9Q8IM4Wb9ZU60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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