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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6c139ff104b39808797b97c8b076cb531e547157a93489318a8043b4f39566' 
  AND token = 'dtgJMINnpPMjul6Ri53PWNQNyd2SR0YcvKN3STTypIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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