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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9068b8c52c0c849497284ffb31901ad15442c0655c13c636011964a689c7e235' 
  AND token = 'Rs+qNRlcQkxk9g6grKCEqkWH2HnqqvZ07MkuITRhT44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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