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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06df3afbd0409f11f0dffb6387e99c22b1a197a5ea76278d5f9412e0f1973e7' 
  AND token = 'Th0AFPb/Hrnz9FU0SWubCLDeuhVtoYLJVijz/RBytoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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