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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba066e3e1b627456d7a3941c8a06ae70a5639a1561112546370927275d418d9' 
  AND token = 'xnh1op0i0FyUF3osVy0VMpGYBR6+FJODrk5fskQCPM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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