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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059faead0dc650039b8b517ea6e22a0a62f16dac56d7d9cecef3d2b0d0a30e35' 
  AND token = 'L2QOveJAz5Mp+TS+emfMw6+JXpRIZZ29jbvlBTKvrSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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