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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c8f31700c22e98a0a70c9a97be7d06ac0c04f84c5e9fe96c3a1a275e5cef671' 
  AND token = 'oL7/OwpYKQvsanIFPOVtaq/2x6XGRqP11/35T0H62r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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