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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8feab2a213f1586891c1c1d70908fed84d7021b8a848552135e6f942b08103' 
  AND token = 'Omy3lze8GMm1GHvZ7AlsnEBj81qfRNL3RMOgWOVs3SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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