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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '774388ae1548b9716fa3df81d8b4f99ceefe5b5b623aafe355c780fe7ace88b7' 
  AND token = 'kR6vmArj58KMmp5k0ZG3XSDtP32zv9W9a2GN+NP/1tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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