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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c3133377b3d52244ddf577421d260d58cc5ab56ad3ec862b2c9093c3023ba7' 
  AND token = 'FUWkqd0k59wNpSUFBRcu/44q03zka5TZyiftln/c+xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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