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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e99095b7914954c86ce62b95584ffef07d6434cca4f0c2dfda8ee82cc38ae0' 
  AND token = 'hOS7P0lDi2gBh0NL0/apoFG2JizMeMgBQ5NUhqVgjpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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