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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1b80139c525ed4deaaa642c34557e6c7d3f45ed3056fea13ee467dc52488a2e' 
  AND token = 'Ne3fHCgB9c5cm92E9rYcwDl1a0qfpAmfk9sPG3wdtWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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