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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847bef6cb5da6f556d092fefaadddc99c5671940bd2a65f1443ae2038f12a0b2' 
  AND token = 'y3hzmJGcFdkciagi/daGWYZ8ZkPMKS0f5FvPb1sr1/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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