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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8306ddeeb9297fcdc2875e1f41b6b0dc690565a5b2ccd10de7555ea2ba8f61eb' 
  AND token = '0bdmAPXILWfaTgdeBIlxQbk+728oYDJinFEUtsM75t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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