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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15fa973266217ed4c4ff805d1c5f60628143e0961e55a1b3ae309ca747cbe74' 
  AND token = 'zmt75QTvK656D44sr5Bbtw8Xic5tKTHJ/p2q4lOGX/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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