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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02d8825292272f055843de253076eebc3046e9ad8501b8b56fd5ebc8b54238b' 
  AND token = 'weD7FJeF9ObZct+BbQgQt4FKTTjnGU69nImlcsh202k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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