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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87706b6dfc51d4435d4a8987d5346323ea24c11a27c0c8fcb9c290845c4c1dc8' 
  AND token = 'SBNbqFhEF2yqr3LKiB/a1FjH4RB+anHhn9AGXCXS1fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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