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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9ac0e552a5fee8c5c74a2674330644fece843e9dd26d611dd597a359ed9593' 
  AND token = 'EFA1U7i4m/yE1e93gWANyTI/4g6yNMRoQo4Mqv7pUcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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