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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1629c60eff98f3fbe103ebc7bf7348c470237191df294ff962cd311d6297b0ec' 
  AND token = '/dGP4oR6iaHeatLsMSnKcj2Ta/hxHJKup0FnSNXYBEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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