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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3993ae47c1f5f9d6cd19734012ec8ddf7fc741bf476bd9f294008145dd143c' 
  AND token = 'r/dhQsG2gDoCSpg7awprLxF9v+Ax5xksbcgn1CmAM7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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