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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f09b3c1df7a8d40639f8f37c16f3082513af47d83c5e560179605413b58d09' 
  AND token = 'zw4V9fAGc3NwxNyQ7/Qx0gSt8uCEGPsngTxXwG9L5cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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