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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ab0ccae84ff7bb0d1219f4725e1d6ea94ede7575d8760cc9dbfb17581e5e58' 
  AND token = 'hgun5SwRNVbSQAtHmOhv1csBEy2GEwgaRS4HQ2Cd0so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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