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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e37c728e0d6595e84cfd23a2a96a30c5981ed14478761c05ffa958486eeeaa70' 
  AND token = '5LzSztys/Gq4Y8CaVZ8xd6Q/511YsDNP+eNbS7dxOQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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