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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87070a8ef81a5567dcada89fd3e53dc0eadb6785dc740ef85fcc4b4311b6a9f' 
  AND token = '4JzyKnjS4STBPvs8VQ5u8lO75n2RrYqLKidwBy6RBmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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