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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ccf87a96fe308d0a54e86bf2a7b0523549338ddb9288086b64bd2b85682888' 
  AND token = 'HWbOGNDkoINH5I3DsEWL2bBGhtT7IVF3hnVpHSDRzzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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