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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5900df031f6d2cf49c99acf05a4e7017a3c21f2f400ccc62d4bc76e32831813e' 
  AND token = '2M7e6TWiFdm0G7290/oq+vcLsc9aBcpab//juk0Gooo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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