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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beee6fa2bf521fffe025efbe84145a1b9dab703a3767d9766fb28e357587dc9c' 
  AND token = '2SvPczDzckHK8ETBISFYi6/j30PT/aEPKPfSCFr3aKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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