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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71152f48aa07b87100969be9530735517889907deeda441b2de34130f329a1a' 
  AND token = '6yRwBZiqTWX9h7e3kdhibvEHVUhhS0ADiKCUQ/Ht2i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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