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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f09e3b5dd34c7008bb5311c64ac23476e2635b16827e3f3d13e95b6b7981c1' 
  AND token = 'MLKJXwtVc8hEoMJx5T17v1cHJY108ASLEPeiKU7bpGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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