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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e009d716d74507af0b4016099da097edd4cac2b4ae01fd37eaaa48ae63ec0a' 
  AND token = 'uNKCyOHp5ur5v/RB8zPysNf5eUTq5d57y0e1kN6CszM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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