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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf1fe44d27c00e42978a78a5fac8f0f60b5353e51e7da683977ce24281be2cf' 
  AND token = 'Qm6F2n83G897miHJdcAN3Thz83+K3sLha4jFIgRlVTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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