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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b098d709ef9323e0db323ca3a6d3feca52018344c52ca13c530da9a087b1d1' 
  AND token = '6zDgNLhsu6yB6fbo95nVP/9J0stPQfweRUzwidBn7eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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