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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3877f0faab468f1cf6a953d3b9a9328792c7095536a7a002745fce34326b566' 
  AND token = 'vOoHekJmPFoCDTtk2WJtWTy/gdYVHQK3HAzM5BTgfk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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