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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a374c91a399d3bae1f7b39041d9b7f1a70654957c987741164abc009425534' 
  AND token = 'KKZE6upp7I13qnWyHkwLULubX4NRHPB07WOauxevb/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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