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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f956c617959fd9061c0985477f633611fcf87733d099b93d9a1b54f2a2aa7a35' 
  AND token = '0Ogb23bshNG3RTGVBdR/5UdrX3N0+Aqbh3GafEphxS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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