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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c18573401914f9ef83bbc2c5fd509952e7437a9bda62d9dad5f88bad825c9e' 
  AND token = 'm2DqRhgy18Re1Nf0mLXVvgQHoT7kSqolWvYGXrhHAo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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