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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8da2a2739a1af8c3c50d7f579145e03bb0a8b19b3519cb5c42970041ae4c23c2' 
  AND token = 'QhNsEmr4/yzsR2VCv18uL1YTMmswClmtlWT91ARTSJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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