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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00db03724258bf1c683e4c05c1f8e9c8d67b20138476b8a9f4562c6d0cb1ed6' 
  AND token = 'i+x1g4FD6ETuZeKvdpEXZAia8znP8UMo8OZgbqYkEbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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