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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9bad7d57fe4f1b8ea9ea22d92b853df743323e02537ce5f769a2a30488bc16' 
  AND token = 'I1S20IWlgrC9rVLrmPEnTBV6pfv5JVD4taXRK9sRYlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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