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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec85c8c3810628cad238d627bef163fbd7691fc6ca0584e9e479e4769b3b61e' 
  AND token = 'gQbDypIK/Kl+dZe27UzqX3KCGfdlDqWIMsy6gDQSOxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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