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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfbfcccecccace89657aef15c0b0b6f01e3fda51bf8df9065f352d31eddba354' 
  AND token = 'BpmmwdTjU946vwp71sK8AVQi+2vzUv+30Wh1i3P7hds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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