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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f089230b82f18ceedd30f15876bb3eb506c34ae2ab45b228839c5616055bb13' 
  AND token = 'A40tqRdmNKdie0WQ1cnTkX3fdF3keFC8TL2qGm9+Iv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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