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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8194829c7b69dfa7de89263820ca4867ccc1e199763b030a7d6923e2c0b36d15' 
  AND token = 'GS+MimoTyQ0uM7KS1pCuBvreyCJljwBtDs9ZjrmjaBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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