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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5a40d7e413ce31f4d22df4976daf09c1b4fd866c05c3beca426004cb73b3ed' 
  AND token = 'UN0NzYNe7+2rkIgsla3upLjxXQB0l/ued+9K3R4Ey+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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