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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ea57796cf43ccd17f7d6567237e12714e691ed7c6e854a21059edf4dde0a5b' 
  AND token = 'dZKCN8d2VWAQ18kPAoGllq9322gQ7FUQyT7t7lD/JLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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