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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0907d4a3f45f50dae483aa6dbea497e95c68b6e48109850ab6db1fb5a61dfe' 
  AND token = 'zJwMDPNQbmpzXHu/9ptTuZovMBxemE9kpkBuYlv7nM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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