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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29be5b7b326ed0459ae8c854e693b84686bb2a596bd60c93b4cd56414e504ea1' 
  AND token = 'B4+HLZOSLXcczEhe3LyeK4IGlaid4P+rRRwzOD2eU9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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